Apparatus for producing stitched trimming strips



June 17,1930. K. MAIER 4 APPARATUS FOR PRODUCING STITCHED TRIIIMING STRIPS Filed Oct. 18, 1926 2 Sheets-Sheet l iiiilln June 17, 1930.

K. MAIER APPARATUS FOR PRODUCING s'rrrcrmn 'rnnmme STRIPS" Filed Oct. 18, 1926 2 Sheets-Sheet 2 Patented June 17, 1930 UNITED STATES- KARL MAIER, OF STUTTGART, GERMANY, ASSIGNOR 1'0 UNION SPECIAL I ,PATEINT. OFFICE FABBII G..MI. B. H., STUTTGART, GERMANY urmrus non. rnonncms srrrcnnn 'rnmume srmrs ap ucaubn'mea October 1a, 1926, Serial No.

The invention relates to new and useful improvements in an'a'pparatus for producing stitched. trimming StllPS, and more particularly a trimming strip wherein a cord is inclosed within a narrow strip and secured therein by a line of stitching.

An objectof the invention is to provide an apparatus wherein a folding guide is used for infolding the edge portions of a narrow strip, and for folding said edge portions about a cord or cords, after which the thus folded narrow strip is passed through a former so that the parts are formed into the desired finished condition for the trimmin strip, and whileso held by. the former, are ed to a stitching mechanism located immediately in rear of the former so that the parts maybe secured together. i

A further object of the invention is to provide an apparatus of the above character with a feeding mechanism which includes an upperfeed dog engaging a trimming strip directly in rear of the needles, and wherein said'upper feed dog is shaped on the under face thereof to conform to the upper surface of the finished trimming strip. These-and other objects will in part be obvious and will in part be hereinafter more fully disclosed. y

In the accompanying drawingslwhich show one embodiment of the apparatus- Figure 1 is a perspective view of a portion of a sewing machine, and with the necessary apparatus attachedto the same for carrying out the invention;

Fig. 2 is a plan view of. a

Fig. 3 is a sectional view on the line A.B of Figures 2 and 6;

Fig. 4 is a sectional view on the line C-D of Figures 2 and- 6; v

Fig. 5 is a plan view ofthe former and the end of the guide associatedtherewith;

Fig. 6 is a bottom plan view .of the fornrer; Fig. 7 is a perspective view of atrimming stri made in accordance with the invention,

sai section being takenon the line EF of Fig. 2, and

ig. 8 isa sectional view of the ad of the upper feed dog on the line G-.-H- of Fig. 2.

142,377, and in Germany November 12, 1925.

underneath the folded in portion 'so that the line'of stitching may pass through the parts parallel with the cord, and said line of stitching will penetrate the infolded portion of the ribbon strip, the edge ortion thereof folded underneath, the infol ed portion, and the body of the narrow strip. There is, of course, a line of stitching adjacent each cord. This trimming strip may be modified, and a single cord alone may be used, but the above trim ming strip is illustrated and described for the purpose of making clear the invention.

The ap aratus embodying the invention consistsof a sewing machineto which is at tached a folder guide and a former. The folder guide is illustrated at 5 in the drawings, while the former is indicated at 9. The narrow strip 2 is first guided through a sponge cup 3, w ere the ribbon strip comes in contact with the sponge and is saturated with oil. The narrow strip next passes through a guide 4 which leads the strip into the folder 5. This folder 5 consists of two tubular members 5, 5, and a guide late 6, so that the narrow strip as it passes t rough the folder will 'be folded atthe side portions thereof into tubular portion of the shape. At the same time, the two cords 1,1

tively so that the side portions 8 of the narrow strip arefolded about .the cords l, 1, res tively. That is to say, the narrow strip is' infolded, and the infolded portions are are introduced through guides 1, 1, respec- V folded around 'and' beneath the cords as described more in detail above in connection with the trimming'strip. This is all accom-- dles, which are indicated at 7 7 The folder is provided with an extension 10, and secured to said extension'and cooperating therewith manner, and is locatedin front of the nee- These lines of stitching secure the parts tois the former 9. This former 9 ,at the inner side thereof is shaped so as to represent two large arcuate inverted grooves 11 which receive the two curls or infolded portions of the narrow strip from the folder 5. These large grooves 11 are tapered or narrowed down to relatively smaller arcuate grooves 12 and intoside grooves 13. The tubular parts of the strip issuing from the folder and passin into the former 9 are pressed or sha e into'the rounded ribs 14 with the cor s 1 inserted therein, and into the flat parts 15 as shown in Fig. 7 of the drawings. The delivery end of the former is shaped to conform precisely to the desired shapin of the trimming strip. As clearly shown in ig. 2 of the drawings, the former is located directly and closely in front of the needles 7, 7 and these needles are so positioned as to'form lines of stitching which pass throu h the pressed flat parts 15 adjacent the cor s 1, l.

gether, and hold the parts of the strip .encircling the cords close togeth and yet so that they may be raised slight l It will be noted that the sewing machine has no presser foot. The former takes the a place of the presser foot. The folder 5 is provided with an extension 10, and the former is secured to this extension by the screws 9, 9. One side of the delivery end of the former is shortened so'tl .t the needles 7, 7 which are set in a line diagonally of the line of feed, may be brought close'to the end of the former.

- Directly in rear of the needles is a feed dog 17 This is of the usual construction of the upper feed dog'so far as mounting and operation of the same is concerned. The end of the feed dog, however, is shaped so as to extend close up to both needles, and the under face of the eed dog is shaped similar to the shaping of the upper under face of the former 9 which bears on the trimming strip.

It is obvious that minor changes in the details of construction and the arrangement of the parts may be made without departing from the spirit of the invention as set forth in the appended claims.

Having thus described the invention," what I claim as new and desire to secure by Letters Patent, is

1. The combinationv of a folder, a

for directing a narrow strip.into said folder, said folder being shaped so as to roll in the edge portions of the narrow strip and turn the edges of the infolded portions underneath said respective infolded portions, cord guides for directing cords into said inturned edge porj tions of the narrow strip, a former located .at the delivery end of the folder and having a tapered passagetherethrough shaped so as to press t e inturned edge portions of the narrow strip flat against the body rtion' of the narrow strip adjacent tlie o0 and if desired. K

stitching needles located at the delivery end of the former for stitching through the parts and securing the same togethen' 2. The combination of a folder, a guide for directing a narrow strip into said folder, said folder being shaped so as to roll in theed e portions of the narrow strip and turn t e edges of the infolded portions underneath said respective infolded portions, cord uides fordirectin cords into said inturne edge portions of t e narrow strip, a formerlocated at the delivery end of the folder and having a tapered passage therethrough shaped so as to press the inturned edge portions of the str1p 9 flat against the body portion of the narrow strip adjacent the cords, stitching needles located at the delivery end of the former for stitching through the parts and securing the same together, and a feed dog engaging the narrow strip on the upper face thereof after it is stitched for drawing the narrow strip throu h the former.

3. e combination of a folder, a guide for directin a narrow strip into said folder, said folder ein shaped so as to roll in the edge portions 0 thenarrow strip and turn the edges of'the infolded portions underneath said respective infolded portions, cord uides for directin .cords into said inturne edge portions of t e narrow strip, a former located at the delivery end of the folder and having a tapered assage therethrough shaped so-as to press t e inturned edge portions of the narrow strip flat against the body portion of the narrow strip adjacent the cords, stitching needles located at the delivery end of the former for stitching through the parts andv securing the same together, and a feed dog engaging the narrow strip on the upper face thereof after it is stitched for drawing the narrow stri through the former, said feed dog being s aped on the under face thereof to conform to the shape of the article being stitched.

- 4. In a sewing machine, the combination of a work support, a folder attached to said work support for guiding'andinfolding the edge portionsof a narrow .strlp, means for guiding cords into the folded portions of the narrow strip, a former located at the dehvery end of the folder, said former having a tapered passageway therethrough conformin in cross section to the sha of the deslred finished article whereby the mfolded narrow strip p'assin -from the folder through the former will given itsdesired final shape stitching needles located. at the dehvery en of the former-and close theretofor stitching the infolded parts of the narrow strip, and,

an upper feed dog directly in rear of the needles for engaging the narrow strip and pulling said narrow strip through said folder and former.

5. In a sewing machine, the combination of a work support, a folder attached to said I I a work support for guiding andinfolding the edge portions of a narrow strip, means forguiding cords into the folded portions of the n narrow strip, a. former located at the deliv- 5 ery endof the folderilsaid former havinga taa pered passageway t erethrough conformin in cross sectionto the shape of the desire finished article whereby the infolded narrow strip passing) from the folder through the former will e given its desired final shape stitching needles located at the delivery en of the former and close thereto for stitching the infolded parts of the narrow strip, and an upper feed dog directly in rear-of the needles for engaging the narrow strip and pullin 'said narrow strip through said folder an former, said feed dog having the under face thereof shaped so as to conform to the upper face ofthe article being stitched. 6. In a sewing machine, the combination of a work support, a folder attached to said work support for guiding and'infoldingi the edge portions of a narrow strip, means forguiding cords into the folded portions of the 5 narrow strip, a former located at the delivcry end of the folder, said former having a tapered passageway the'rethrough conforming in cross section to the shape of the desired finished article whereby the infolded narrow 3o strip passin from the folder through the former will e given its desired final shape,

I stitching needles located at the delivery end of the former and close thereto for stitching the infolded parts of the narrow strip, an upper feed dog directly in rear of the needles.

for engaging the narrow strip and pulling said narrow strip'through said folder and former, said feed dog having the under face thereof shapedso as to'jco'nform to the upper 40 fa'ceof the article being stitched, and means for moistening the outer face of the narrow strip with oil as it passes into the folder to aid in the free passage of the narrow strip g a through the former. 7. The combination of a folder for interfolding fabric parts, an independent tapered former at the delivery. end of the folder for receiving said" interfolded parts and for crowding said interfolded parts into close I contact with each other, a feeding mechanism including a feed dog for engaging the upper face of the interfolded fabric parts at a point in rear of the former for drawing the interfolded fabric parts through the former, and 5 a stitching mechanism including needles adapted to pass though the interfolded parts of the fabric between the former and the feed do for securing said interfolded, parts.

fn testimony whereof, I afiix my signature.

KARL MA IER. 

